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Kirill Smelkov acac03fa15 perf record: Add "nodelay" mode, disabled by default ... Sometimes there is a need to use perf in "live-log" mode. The problem is, for seldom events, actual info output is largely delayed because perf-record reads sample data in whole pages. So for such scenarious, add flag for perf-record to go in "nodelay" mode. To track e.g. what's going on in icmp_rcv while ping is running Use it with something like this: (1) $ perf probe -L icmp_rcv | grep -U8 '^ *43\>' goto error; } 38 if (!pskb_pull(skb, sizeof(*icmph))) goto error; icmph = icmp_hdr(skb); 43 ICMPMSGIN_INC_STATS_BH(net, icmph->type); /* * 18 is the highest 'known' ICMP type. Anything else is a mystery * * RFC 1122: 3.2.2 Unknown ICMP messages types MUST be silently * discarded. */ 50 if (icmph->type > NR_ICMP_TYPES) goto error; $ perf probe icmp_rcv:43 'type=icmph->type' (2) $ cat trace-icmp.py [...] def trace_begin(): print "in trace_begin" def trace_end(): print "in trace_end" def probe__icmp_rcv(event_name, context, common_cpu, common_secs, common_nsecs, common_pid, common_comm, __probe_ip, type): print_header(event_name, common_cpu, common_secs, common_nsecs, common_pid, common_comm) print "__probe_ip=%u, type=%u\n" % \ (__probe_ip, type), [...] (3) $ perf record -a -D -e probe:icmp_rcv -o - | \ perf script -i - -s trace-icmp.py Thanks to Peter Zijlstra for pointing how to do it. Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu>, Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <20110112140613.GA11698@tugrik.mns.mnsspb.ru> Signed-off-by: Kirill Smelkov <kirr@mns.spb.ru> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>		14 years ago
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Makefile	…
asciidoc.conf	…
examples.txt	…
manpage-1.72.xsl	…
manpage-base.xsl	…
manpage-bold-literal.xsl	…
manpage-normal.xsl	…
manpage-suppress-sp.xsl	…
perf-annotate.txt	…
perf-archive.txt	…
perf-bench.txt	…
perf-buildid-cache.txt	…
perf-buildid-list.txt	…
perf-diff.txt	perf symbols: Add symfs option for off-box analysis using specified tree	14 years ago
perf-help.txt	…
perf-inject.txt	…
perf-kmem.txt	…
perf-kvm.txt	…
perf-list.txt	…
perf-lock.txt	…
perf-probe.txt	perf probe: Fix line range description since a single file is allowed	14 years ago
perf-record.txt	perf record: Add "nodelay" mode, disabled by default	14 years ago
perf-report.txt	perf symbols: Add symfs option for off-box analysis using specified tree	14 years ago
perf-sched.txt	perf sched: Document missing options	14 years ago
perf-script-perl.txt	…
perf-script-python.txt	…
perf-script.txt	Merge branch 'perf/core' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux-2.6 into perf/core	14 years ago
perf-stat.txt	perf stat: Add csv-style output	14 years ago
perf-test.txt	perf test: Fix spelling mistake in documentation	14 years ago
perf-timechart.txt	perf symbols: Add symfs option for off-box analysis using specified tree	14 years ago
perf-top.txt	perf top: Document missing options	14 years ago
perf.txt	…